(19)
(11) EP 1 323 673 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.01.2004 Bulletin 2004/05

(43) Date of publication A2:
02.07.2003 Bulletin 2003/27

(21) Application number: 02258936.0

(22) Date of filing: 24.12.2002
(51) International Patent Classification (IPC)7: C01B 33/18, C09C 1/00
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR
Designated Extension States:
AL LT LV MK RO

(30) Priority: 27.12.2001 JP 2001397283

(71) Applicant: TOKUYAMA CORPORATION
Tokuyama-shi, Yamaguchi-ken 745-0053 (JP)

(72) Inventors:
  • Kato, Hiroshi, Tokuyama Corporation
    Tokuyama-shi, Yamaguchi-ken (JP)
  • Tamura, Michimasa, Tokuyama Corporation
    Tokuyama-shi, Yamaguchi-ken (JP)
  • Kameda, Makoto, Tokuyama Corporation
    Tokuyama-shi, Yamaguchi-ken (JP)

(74) Representative: Benson, John Everett 
J. A. Kemp & Co., 14 South Square, Gray's Inn
London WC1R 5JJ
London WC1R 5JJ (GB)

   


(54) Silica-metal oxide composite particles and method of producing the same


(57) Silica composite oxide particles comprising silica and a metal oxide other than silica, the content of the metal oxide other than silica being from 30 to 50 mol%, and a coefficient of variation in the particle diameter being not larger than 30%. The silica composite oxide particles contain metal oxides other than silica in an amount of not smaller than 30 mol%, which could not be produced thus far, and feature excellent spherical shape and excellent monodispersion property.






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